These figures belong to the named source and method. Historical costs are not current quotations. A value without its stage, material basis or measurement location is not a farm instruction.
| What is measured | Value and basis | Source and limitation |
|---|---|---|
| Air changes, first two flushes | 6 per hour | ICAR-DMR manual, 2011. When carbon dioxide output is highest. |
| Fly screening on doors and vents | 35 mesh or finer | NHB DPR model, 2018. A drawing decision, not a spray. |

